Ellialtıoğlu, Süleyman Şinasi
The chemisorption of an oxygen adatom on the (001) surface of a perovskite crystal is examined parametrically. An empirical tight-binding method is used in the calculations. The adatom is assumed to chemisorb in a head-on position to the surface cation and the effects of the following parameters are investigated: the orbital interaction V(p) between adatom and surface cation, the difference DELTAE(d) in the self-energies of a surface cation and a bulk one, and the local perturbation DELTAw0 on the self-energy of the surface cation that participated in the chemisorption bond. As a result of chemisorption the oxygen adatom shares the delocalized surface states of the perovskite, and in addition to that two peaks appear next to the surface states, one below the surface band being a bonding state and one above it, being an antibonding state. The change in chemisorption energy with the adatom-surface interaction strength has been investigated.


Thermodynamic properties of 1 x MgCl2 xCaCl2 melts
Karakaya, İshak (1986-01-01)
An electrochemical formation cell was used to measure the partial molar thermodynamic properties of MgCl2 in {(1−x)MgCl2 + xCaCl2}(1). The results indicate that the melt is nearly ideal in the Raoultian (or Temkin) sense. A classical-thermodynamics analysis of the results was used to construct the T(x) phase diagram which was found to be in good agreement with the accepted diagram.
PARK, JONGEE; Öztürk, Abdullah (World Scientific Pub Co Pte Lt, 2013-02-01)
Glass-ceramics containing only apatite and wollastonite crystals were produced in the system MgO-CaO-SiO2-P2O5-F by the melt casting process. The bioactivity of the glass-ceramics was determined by immersing the glass-ceramics in a simulated body fluid (SBF) and by assessing the resulting apatite formation on the free surface after various immersion durations. A 12-mu m-thick apatite layer formed on the surface of the glass-ceramic containing only apatite crystals after 20 days immersion in SBF. However, th...
Composition dependence of lattice parameters and band gap energies of thallium based layered mixed crystals
Hasanlı, Nızamı (2015-07-01)
Compositional dependence of lattice parameters and unit cell volumes of TlMeX2-type (Me = Ga or In and X = S or Se) layered mixed crystals with monoclinic structure has been studied by X-ray diffraction technique. It is revealed that the lattice parameters of TlGa1-xInxSe2, TlGa(S1-xSex)(2), TlGa1-xInxS2 and TlIn(Se1-xSx)(2) mixed crystals increase due to the substitution of gallium atoms by indium and sulfur atoms by selenium. Moreover, the absorption edges of these mixed crystals have been investigated th...
Excitation and temperature tuned photoluminescence in Tl2In2S3Se layered crystals
Güler, Işıkhan; Hasanlı, Nızamı (2006-12-01)
Photoluminescence spectra of Tl2In2S3Se layered single crystals have been studied in the wavelength region of 535-725 nm and in the temperature range of 22-58 K. Two photoluminescence bands centered at 564 (2.20 eV, A-band) and 642 nm (1.93 eV, B-band) were observed at T = 22 K. Variations of both bands have been investigated as a function of excitation laser intensity in the range from 16 to 516 mW cm(-2). These bands are attributed to recombination of charge carriers through donor-acceptor pairs located i...
Synthesis of CuO nanostructures on zeolite-Y and investigation of their CO2 adsorption properties
Boruban, Cansu; Nalbant Esentürk, Emren (2017-10-01)
Copper(II) oxide (CuO) nanoparticles (NPs) in two different morphologies, spiky and spherical, were synthesized on zeolite-Y by a modified impregnation method, and their CO2 adsorbing capabilities were investigated under standard conditions (1 atm and 298 K). The properties and CO2 adsorption performances of the hybrid systems were characterized by transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, atomic absorption s...
Citation Formats
H. KOKTEN and S. Ş. Ellialtıoğlu, “CHEMISORPTION OF A P-ADSORBATE ON PEROVSKITES,” PHYSICA B, pp. 39–44, 1994, Accessed: 00, 2020. [Online]. Available: